488 STRUCTURE OP BRAIN chap. xxiv. 



Ateles (Spider Monkey). 

 Cebus (Capuchin Monkey). 

 Pithecia (Saki). 

 NyctipWiecus (Douricouli). 



Hapale (Marmoset). 



OtoUcnus. 



Stenops. 



Lemur. 



In July, 1861, Mr. Marshall, in a paper on the brain of a 

 young Chimpanzee, which he had dissected immediately after 

 its death, gave a series of photographic drawings, showing 

 that when the parts are all in a fresh state, the posterior lobe 

 of the cerebrum, instead of simply covering the cerebellum, is 

 prolonged backwards beyond it even to a gi-eater extent than 

 in Gratiolet's figure, 56, p. 482, and, what is more in point, 

 in a greater degree relatively speaking (at least in the young 

 state of the animal) than in Man. In fact, "the projection is 

 to the extent of about one-ninth of the total length of the 

 cerebrum, whereas the average excess of overlapping is only 

 one-eleventh in the human brain."* 



The same author gives an instructive account of the man- 

 ner in which displacement and distortion take jjlace when 

 such bi'ains are preserved in spirits as in the ordinary pre- 

 parations of the anatomist. 



Mr. Flower, in a recent paper on the posterior lobe of the 

 cerebrum in the Quadrumana,f remarks that although 

 Tiedemann had declared himself unable in 1821 to detect 

 the hippocampus minor or the j)Osterior cornu of the lateral 

 ventricle in the brain of a Macacus dissected by him, Cuvier, 

 nevertheless, mentions the latter as characteristic of Man 

 and the apes, and M. Serrcs, in his well-known work on 

 the brain in 1826, has shown in at least four species of apes 



* Natural History Review, July, of backward extension of the cerebrum 



1861, by John Marshall, F.R.S., in some races of Man. Medical Times, 



Surgeon to University College Hos- October, 1S62, p. 419. 

 pital. See also on this subject Pro- f Philosophical Transactions, 1862, 



fessor Rolleston on the slight degree p. 185. 



